package com.sczmgk.hotline.des;

import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESedeKeySpec;

public class Des3 {
    public static void main(String[] args) throws Exception {

    }

    /**
     * ECB加密,不要IV
     *
     * @param key  密钥
     * @param data 明文
     * @return Base64 编码的密文
     */
    public static String des3EncodeECB(String key, String data) {
        String encode = "";
        if (isEmpty(data)) {
            return null;
        }
        try {
            byte[] db = data.getBytes("UTF-8");
            byte[] kb = key.getBytes("UTF-8");
            Key deskey = null;
            DESedeKeySpec spec = new DESedeKeySpec(kb);
            SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
            deskey = keyfactory.generateSecret(spec);
            Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
            cipher.init(Cipher.ENCRYPT_MODE, deskey);
            byte[] bOut = cipher.doFinal(db);
            encode = Base64.encodeToString(bOut, Base64.NO_WRAP).trim();// 自定义
            return encode;
        } catch (Exception e) {
        }
        return encode;
    }

    /**
     * ECB解密,不要IV
     *
     * @param key  密钥
     * @param data Base64编码的密文
     * @return 明文
     * @throws Exception
     */
    public static String des3DecodeECB(String key, String data) {
        String decodeStr = "";
        if (isEmpty(data)) {
            return null;
        }
        try {
            byte[] kb = key.getBytes("UTF-8");
            Key deskey = null;
            byte[] decode = Base64.decode(data, Base64.NO_WRAP);
            DESedeKeySpec spec = new DESedeKeySpec(kb);
            SecretKeyFactory keyfactory = SecretKeyFactory.getInstance("desede");
            deskey = keyfactory.generateSecret(spec);
            Cipher cipher = Cipher.getInstance("desede" + "/ECB/PKCS5Padding");
            cipher.init(Cipher.DECRYPT_MODE, deskey);
            byte[] bOut = cipher.doFinal(decode);
            decodeStr = new String(bOut, "utf-8");
        } catch (Exception e) {
        }
        return decodeStr;
    }

    /**
     * 是否为空
     *
     * @param value
     * @return
     */
    public static boolean isEmpty(String value) {
        if (value == null || value.length() == 0 || "null".equals(value)) {
            return true;
        } else
            return false;
    }
}
